如图所示的电路中若只需要灯l1亮则需要闭合开关 要使灯lll2串联则应只闭合开关 要使灯l1l2并联则应闭合开关 .——青夏 Template




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tomski如图所示的电路中若只需要灯l1亮则需要闭合开关 要使灯lll2串联则应只闭合开关 要使灯l1l2并联则应闭合开关 coloring